Rotary stropping or grinding device



April 13 1926.

J. A. D. WATT ROTARY STRUPPING OR GRINDING DEVICE Filed May 5, 1922 buffing the edges Patented A r. 13, was;

lsaaass JAMES ALEX DENBY 'WATT, OF ZONDON, ENGLAND.

I ROTARY S'IROPPING OR GRINDING DEVICE.

Application filed May 3,

To all whom it may concern:

Be it known that JAMES Ari-n x Danny WATT, a subject of the King of Great Britaimrcsiding at 142'Tulse Hill, London,

S. W. 2 En land has-invented a newand Rotary Stropping or useful Improvement in Grinding Devices; and he does hereby declare the following to be a full, clear, and exact description of the same.

This invention has reference to improvements in rotary stropping, grinding,honing or buffing devices, and is particularly-appli-- cable for stropping, grinding, honing or of razor blades, surgical instruments, or other edge tools of a like nature.

The object of the present invention is to overcome the difficulty of stropping, grinding honing or buffing the edge of the blade or tool with a duplex roller device owing to the fact that the meeting surfaces-"f the rollers during the stropping, grinding, honing or bufiing operation leave the actual edge at too acute an angle.

My present invention fundamentally differs from rotary stropping or like devices heretofore known in that the complementary roller which forms the meansfor maintaining the blade edge in stropping contact with the helically wound stropping face of the other roller is formed with a resilient surface of such a nature that it can partially be located within the helical groove of the other roller and thereby form a particularly efiicient frictionally driven complementary roller, the periphery of which intersects the helical stropping periphery of the other roller, the resiliently surfaced complementary roller serving as a means for buffing the opposite face of the blade edge to that which is in contact with the helical stropping surface. In addition to the surface of the complementary roller being of a resilient nature I may resiliently mount this roller. It is common practice to employ a stropping roller having its stropping surface helically wound and to that part of my stropping device no claim per se is made.

One means of carrying the present invention into effect will now be described with reference to the accompanying sheet of drawings in which similar reference numerals indicate similar parts inthe several views 1 Flg. 1 is a sectional elevation through the sharpening strapping, honing or buff ng 1922. Serial N0. 558,121.

rollers, the top roller being of a resilient nature.

Fig. 2 1s a front elevation of the arrangement of the rollers seen in Figure 1.

Fig. 3 is a sideelevation.

In Figure 1 will be seen a razor blade 5 which is maintained in the stropping position. The lower roller 6 is formed with a helical-groove 6 on its periphery, the groove being formed between the windings of the helically wound stropping or honing surface 7. The upper roller 8 which is formed of a resilient material is adapted to contact seen with the bottom roller 6 and as clearly in the drawings the resilient periphery of the roller 8 is forced into the helical groove 6 and thereby the upper roller ,8 isfrictionally driven effectively from the bottom roller .6. The bottom roller 6 is driven from a spur wheel 9 which meshes with a pinion 10 on the spindle ofjthe roller 6 and motion is imparted to the wheel 9 by means of the pivotally mounted key 11 secured to the spindle 12 on which the toothed wheel 9 is mounted. The spindle 12 and the spindles 14 and 15 of the top and bottom rollers 8 and 6 respectively are all mounted in this illustration of the invention in a sheet metal bracket 13. The bracket 18 is provided on each side with a slot 16, in which the ends of the spindles 14: are adjustably seated, and springs 17 secured to eachend of spindle 14 and to the bracket 13 serve yieldingly to hold the roller 8 in engagement with the roller 6. In this construction the sharpening or like operation is performed by the surface of the helically wound strip '7 of the bottom roller 6 the edge of the razor blade resting on this helix and being pressed and maintained into sharpening or stropping contact therewith by means of the resilient and spreading nature of the top roller 8, this function of the roller 8 will be clearly seen on reference to Figure 1 of the drawings, the roller 8 at the same time buffing sheer across theupper edge of the blade 5. Preferably the axis of the top roller is set out of vertical alignment with the bottom roller 6' slightly toward the direction from which the blade to be in practice to give the most eflicient results. As shown in the drawings, the blade is intropurposes on the side opposite to that on WhlCl the key 11 is locatedstropped is received 7 by the roller 6, such a setting being found duced between the rollers for sharpening ill) By the aforesaid methods the stropping, grinding, honing, or bufiing surfaces of the rollers intersect each other as they revolve with the result that when a blade is positioned thereon in the grinding or stropping position desired to obtain any degree of contained angle of edge the stropping angle is more obtuse than would be the case if stropping rollers of the same diameter were employed in which the peripheries do not intersect one another.

The helical stropping surface 7 of the lower roller 6 may be formed of any suitable material and can be impregnated with an abrasive. The resilient roller 8 is adjusted as to position until it-can turn freely by the frictional drive of the other roller; this roller overlaps the blade edge sufiiciently to effect an adequate bufiing operation across the edge. Owing to the impingement of the periphery of the resilient roller 8 within the-helical groove of the roller 6 it results in the impinging part of the resil ient roller being varied under rotation and caused to travel across the top face and edge of the blade. The resilient periphery of the roller 8 serves the subsidiary purpose of maintaining the blade edge in the desired degree of contact with the helical surface 7, in forming an efficient frictional contact between the peripheries of the two rollers and in effecting a bufling operation on the opposite side of the blade edge to that which is acted upon by the surface 7 of the roller 6.

The aforesaid sharpening or the like device can be located within a box which is adapted to contain a razor frame, in the manner substantially as described in the specification of my application Serial No. 56,626, filed March 29th, 1921.

Claims 1. A rotary sharpening device, comprising a hard roller formed with a helically wound sharpening surface, a complementary resili ently surfaced soft roller in engagementwith the hard roller, said soft roller having a smooth, unbroken, solid surface, means for pressing the rollers in engagement with each other whereby their peripheries inter sect, and means for positively driving the hard roller.

2. A rotary sharpening device, comprising a hard roller formed with a helically wound sharpening surface, a complementary resiliently surfaced soft roller in engagement with the hard roller, said soft roller having a smooth, unbroken, solid surface, resilient means for pressing the rollers in engagement with each other whereby their peripheries intersect, and means for positively driving the hard roller.

In testimony whereof, I have signed my name to this specification.

JAB IE8 ALEX DENBY WATT. 

